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Which of the following must have been held constant in order for the results of the testing process to be considered valid?

A.) The length of time it took the material samples to reach 180 K
B.) The shape and size of the material samples
C.) The electrical conductivity of the material samples
D.) The temperature of the material samples

Which of the following must have been held constant in order for the results of the testing process to be considered valid A The length of time it took the mate class=

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hisqueen001

The electrical conductivity of the material samples

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